Question on ETF's

I heard fomr s friend that you can buy Bond ETF's?? How does this work? Canyou just buy a bunch of the treasury shares and you make interst on the shares which is paid to your trading account?? anyonw know about these??
 
symbols are:

SHY (1-3 yr T)
IEF (7-10 yr T)
TLT (20+ yrs T)
LQD (corporate)

think they pretty much function like the SPY, QQQ and DIA.
 
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